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Disconnecting the inverter from voltage sources / performing a restart
Procedure for end users:
For safety reasons, inverters must only be disconnected by an electrically qualified person.
As system operator, however, you can restart the device by switching off the inverter’s circuit breaker overnight and switching it back on again the next morning.
This means that the inverter is disconnected on the DC side (because no PV is generated at night) as well as from the AC overnight, and the required waiting time to discharge the capacitors is complied with.
You can switch the circuit breaker back on the next morning.
Procedure for electrically qualified persons:
A detailed description of the procedure, as well as the warnings that are essential to bear in mind, can be found in the valid operating, installation or service manual of the inverter. Follow all safety precautions listed there at all times.
However, based on past experience, we wish to state here that the inverter will not have been disconnected until
- the circuit breaker has been switched off;
- the ESS handle has been pulled and, depending on the device type, the DC switch-disconnector has been set to position 0;
- and all DC connectors have been unlocked and removed.
The inverter then needs around 20 minutes until all capacitors in the device have been discharged.